Abstract : This investigation, based on acoustic data for six native speakers, and on X-ray data for two native speakers, reports on gemination in Tarifit Berber spoken in Northern Morocco. It presents results of articulatory and acoustic investigations of singleton and geminate voiced and voiceless consonants, produced in word initial, word medial, and word final positions, at a normal and at a fast speaking rate. Speech rate is varied in order to evaluate the robustness of the phonological contrast. Special attention is paid to the timing of tongue gestures in producing this phonological contrast.